Spool



May 6,1924. 1,493,348

F. KUHLMANN SPOOL Filed Jan. 31 1922 WITNESSES jn'xuhlmalnn ATTORNEYS Patented May 6, 1924. I

UNITED r 1,496,348 ENT OFFICE.

FRANK KUHLMANN', OF NEW YORK, N. Y.

SPOOL.

Application filed January 31, 1922. Serial No. 532,994.

lowing is a full, clear, and exact description- This invention relates to spools.

Muchattention has been given to thecon struction of paperspools which possesses suflicient rigidity to prevent collapse when in use. Another difliculty sometimes experienced is the providing of caps used in the construction of the spools provided with flanges of even width throughout. Spools constructed so that the inner face of the spool ridges are straight walls at right angles to the surface of the cylinders are objectionable due to the fact that the outer layer of thread or the like wound thereonhas a tendency to creep over the spool ridges.

The general object of this invention is the provision of a cheap, light paper spool that possesses great rigidity.

A further object is the provision of a paper spool provided with ridges, the inner faces of which slope outwards from the spool cylinder. 1

These objects are accomplished by providing a hollow cylinder, and fitting into the ends of the same two dish-shaped caps with their bottoms inward, thus forming walls in the cylinder at a distance from each end, adding rigidity to the same and providing in conjunction with the caps flanges which extend beyond the cylinder and slope outward.

These and other. objects of the invention will be more clearly understood from the following detailed description and accompanying drawings.

Figure 1 is a side elevation of the spool;

Figure 2 is an end elevation; g I

Figure 3 is a cross section through the spool, showing its construction. 3

Referring to the above-mentioned drawings, a hollow cylinder 10 made in any usual manner and of the desired length, is pro vided. Two dish-shaped caps 11 and 12, whose exterior diameter is approximately the same as the interior diameter of the cylinder, are fitted into the ends of the cylinder, as shown in Figure 3. The bottoms of the dish-shaped caps extend inward and the sides are made of such a height that the bottoms are located about one-quarter of the length of the cylinder from the ends. The

sides of each dish-shaped cap extends at right angles to its bottom and parallel to the wallof the cylinder. The caps may be retained in position by adhesive material of any kind. Each cap has a circular opening 13 extending therethrough and concentric with its centre. Flanges 14: and 15 are provided; in conjunction with the caps 11 and 12, respectively. These flanges extend outward beyond the cylinder 10 and serve as spool ridges to retain the thread or the like wound upon the spool in position. In order to prevent creeping of the 'outer layer of the thread or the likewound upon the spool 1 these flanges are sloped outward from the cylinder.

Such a construction has a considerable advantage over the usual paper spool, which is constructed from a cylinder having caps fitted over the ends with the flanges forming the spool ridges positioned at a distance from the end of the cylinder. In such a case the ends of the caps add little to the strength of the cylinder. Further, this construction cuts down thelength of the cylinder required for the making of a given num-' ber of spools.

Nearly all the operations in the construction of this spool may be accomplished by machinery, requiring very little manhandling and thus reducing the cost of manufacture.

I would state in conclusion that while the illustrated example constitutes a practical embodiment of my invention I do not limit myself strictly to the exact details herein illustrated since manifestly the same can be considerably varied without departing from the spirit of theinvention as defined in the appended claim.

Claim:

As a new article of manufacture, a paper spool, consisting of a'hollow paper cylinder open at its ends, and two dish shaped paper disksfltting in and cemented to the ends of the cylinder, each disk having an opening in its bottom and provided at its open end with an outwardly extending annular flange, said flanges being comparatively short and pro jecting approximately at right angles, whereby the flanges will project beyond the. ends of the cylinder a trifle more than the thickness of said flanges.

FRANK KUHLMANN. 

